Machine for smoothing or ironing leather, particularly shoe sole leather



A. BuEK 2,532,601 v MACHINE FOR SMOOTHING OR IRONLNG LEATHER, PARTICULARLY SHOE SOLE LEATHER Filed Aug. 17, 1948 2 Sheets-Sheet 1 Dec. 5, 1950 O u M 3nventor= I M (lttornegx.

Dec. 5, 1950 A. BUEK MACHINE FOR SMOOTHING OR IRONING LEATHER,

PARTICULARLY SHOE soLE LEATHER 2 Sheets-Sheet 2 Filed Aug. 17, 1948 Patented Dec. 5, 1950 MACHINE FOR ,SMOOTHING or; IRONINGT LEATHER; PARTIGULABLX" s io so E LEATHER;

do n k ro v chos vak a, ssi r orto B ata;- nafrodni podnik, Zlin Qzechoslovakia:

ApmicationAu hfl, 9 Serial 4-;768" In. Czechoslovakia Augusta-27; 1-9497 se (cre m For" rolling (ironing)? or smoothing leather, more particularlyshoe sole-leather, bridge rollingmachinesare-usedprovided with a heavy reciproe cating rollfor -smoothing-the leather; The roll? ing pressuresimplie'd such a" process are very highand; with the presenticonstruction or the rolling; machines; the pressures exertedj'lra-ve an adverse effect-onthe borders of the shoe v sole leatherbeingtreated-i The high pressure exerted} by-the pressure e erating means on the working;- roll which after-its passage overth'e leather under;

treatment falls from theboi'der of the'latter-do'wn onto themetalwplateof the working 'tabl-e, crushes thebbrdrs of the'l'eath'erwhen the roll slipsdown overethe-ed'ge of-'theleather; and their moves up; again over-such edge; since" the borders cannot resist-such a highinstantaneousressure; A

leatherwhi'ch has-been darnagedin-fchis way-gives rise to 'a considerable: increase ofWaste'during its; further treatmentli e. cutting; ofi andstamping of sole pieces therefrom;

To avoid suchan" undesirab-le damage to the leather use-has-beenmade e-.- g.- of"supportir lg pieceswhich the assistant' places againstthe edgesofathe leather" under treatment when the roll =rides: on and:-offthe leather; However; this auxiliary provision not onlycomplicates-theworle of theassistant; but-also-leadsto a-high riskaof injury. each time-thee, assistant inserts the" sup-- porting: piecesunder-: the a moving roll;

In order to eliminate the; imperfections re ferred=to-; it has been proposed; for instance, to

mount vtheworkingeroll in suchea way as to prevents-it from-,falling down onto the-working plate ofthe table when the rollhas passed over the Howevery this construction has failed.inepractice -mainly 'for the reason that the roll when moving back is still: rotating; due to -its leather-s edge inertia, in: the .same direction as-during its preturned do wn in-iront of the advancing roll, crushing at th same time the leather edge.

It has been proposedfurther on to impart to the working roll-a posi'tive rotary motion in uninr t he v, l i s ovement or, the vr011 ove the leather. This arrangement permits tq ayoide the necessity of placing supporting pieces against the leather edgesobut has severaldisadvantages. The driving means for rotating the working roller is verys co nplicated and;in;;c on bination with as as? ran miss on. se hssll ae-blfiizffll the; l in process. Owing; to its; continuouswinding and; unwinding',.. the rope is subj ectedto; considerable stresses and. soonebecornes damaged; Since it is; practically impossible 1 to; protect the, rope: by; a;. cover; throughout its length, broken. wire pieces and particles of lubricantzoitensfall down onto. the,leather.-, which iszbeingerolled and depreciate thesama Ase-aiurtherisolntion amarrangementh-as been: proposed; in. which the; working, roll; instead; of: being connected directly to;-. .the. pressure generate. ing; meansais lfastened; to: ratrocking lever; fixedly secured ahitssone side, the-rol-lzresting; onethez. working table or" theemachinecunder; theeactione of its own-weight, only; Wherebyrthe roll does 2110i, en a czwithuthee pressure exerting,- means until after the rocking lever has been causedito-rrochzpw rds;; Ga fli s he rollihasbeen brohghtzom t the leatherztoibe smoothed. The disachzane. tages of this constructionssuch as eegetheepdiie-l ficult-iesi; encountereds in; adjusting the; pressure andv the level. of; the; pressure; exerting, means have; prevented; this design; from, beingv exten c sively used in practice,

The, present invention; .byeproyidingca ,nemanda substantially improved mode;v oi; construction of." the -r011i r 1g;;deyic giveseatveryt satisfaotoryasolue tion to;the fundamental problem, i.-;e. permitsgtos avoiderushhggof th ebordersof the-gleathenunder: treatmentr-bxgthe WOljkingJQllwhichzrides 0n f; the Nathannder the.- effect, of; itsproper; i h-1? y;- i h. utthe-influence; cf3the:.p-res-=-., ure;- exertname n The=-essential ,fealil leaoi': the present" invention i resides in rcom pletely separating,the working roll: from; their-pressuregenerating means :in; such ays. s .ma ;e oll earingsetogether; with the I roll 'freel slidalolemp; and down, alongzaizpathaiz andwwithin a pace 7 confirmed by ,the walls Dirt/heu erri seirem nslthet us xplet ii l oe i l ve s- T heepressurs ene at ng; means- With this; con truction the. pressures exerting. means. may: as se r; djusted by, 1 means i of: a;

Single ands-l e a ed diu tingmember :1 to;- the:v v

esi i de oll ngpressure; andib'y means Ref another:- nd operated: member it: is possible; to adjust:

, the: .p ssure exerting; means iasea: unit so :as .-to;=.

the pressure exerting device which is adjusted to operate at the moment when the roller bearings have been raised to a distance equivalent to the thickness of the leather treated, is still inactive. It is not until the end phase of the movement of the working roll onto the leather has been reached, i. e. after the roll bearings have been brought in contact with the thrust plates of the toggle levers, that the previously adjusted pressure begins to act upon the bearings and thus upon the working roll and the leather to be smoothed. The reverse operation takes place when the roll slips down the leather under treatment. In this stage the rolling pressure of the pressure exerting device acts only during the period when the roll is travelling over the leather. As soon as the working roll begins to slip off the leather, the bearings of the roll move beyond the extreme point of the operating range of the pressure exerting device which thereby ceases to act upon the roll bearings and thus upon the roll itself, so that the latter slips down, under the efiect of its own weight only, from the leather onto the plate of the working table.

By means of this apparatus, which is very simple in its principle and in design, perfectly sound borders are obtained on rolled raw leather without the aid of edge supporting pieces to be inserted beneath the moving roll.

An example of carrying out the invention will be described hereinafter with reference to the accompanying drawing in which:

Fig. 1 is a side view of the pressure generating device in combination with a separate working roll; and

Fig. 2 is a cross-section through the pressure generating device and the associated separate roll on the line 2-2 of Fig. 1.

A carriage 3 movable to and fro is supported on an upper beam I by means of rollers 2. Reciprocating movement is imparted to the carriage 3 by means of a screw spindle 4. The pressure generating device comprises toggle levers 5, thrust plates 6 and sleeves I in which compression springs 8 are mounted. The springs 8 are adjusted to the required pressure by means of a regulating screw 9 and nuts [0. The regulating screw 9 is controlled from a hand wheel I I, Fig. 1, by means of a double chain transmission 2|. The pressure generating device as a whole is hung by means of screws [2, Fig. 2, from the carriage 3. The screws I2 are interconnected by means of a chain l3, and by a hand wheel M, Fig. 1, the pressure device may be raised or lowered as a unit through the intermediary of a double chain transmission 22 according to requirements. The working roll IS with its bearings 16 rests always under its own weight on the working plate of the table II, the said working plate being carried by a lower beam [8. Since the working roll is formed separately from the pressure generating device, clearances [9 may be left between the lower thrust plates 6 and the bearings [6 of the roll, and the size of these clearances may be increased or decreased as required by turning the handwheel [4. The arrangement of the supporting rollers 20 is broadly known and is not comprised within the scope of the present invention. By forming the working roll [5 with its bearings l6 separately from the pressure exerting device and thus separately from the carriage 3, the carriage and the rollers 2 are substantially re lieved.

What I claim is:

1. In a bridge rolling machine including a carriage, a pressure exerting device mounted on the carriage comprising spring biased toggle levers and vertically movable thrust plates actuated by said toggle levers, and a vertically movable working roll having bearings engaged by said thrust plates, the arrangement of the bearings of the working roll so as to be completely separate from the pressure exerting device of the machine and to be freely movable up and down along a path and in a space confined by the walls of the carriage frame and by the thrust plates of the toggle levers of the pressure exerting device, the latter being mounted as an adjustable unit in the carriage frame in such a way that the clearances between the bearings of the working roll and the thrust plates of the toggle levers of the pressure exerting device are variable as required, within the limits of a free movement, not loaded by the said pressure exerting device, of the working roll.

2. In a bridge rolling machine including a carriage, a pressure exerting device mounted on the carriage comprising spring biased toggle levers and vertically movable thrust plates actuated by said toggle levers, and a vertically movable working roll having bearings engaged by said thrust plates, the arrangement of the bearings of the working roll so as to be completely separate from the pressure exerting device of the machine and to be freely movable up and down along a path and in a space confined by the walls of the carriage frame and by the thrust plates of the toggle levers of the pressure exerting device, the preliminary tension of the pressure exerting device being adjustable by independent adjusting means adapted to operate independently of the adjustment of the clearance between the bearings of the working roll and the thrust plates of the toggle levers of the pressure exerting device.

3. In a bridge rolling machine including a carriage, a pressure exerting device mounted on the carriage comprising spring biased toggle levers and vertically movable thrust plates actuated by said toggle levers, and a vertically movable working roll having bearings engaged by said thrust plates, the arrangement of the bearings of the working roll so as to be completely separate from the pressure exerting device of the machine and to be freely movable up and down along a path and in a space confined by the walls of the carriage frame and by the thrust plates of the toggle levers of the pressure exerting device, the latter being mounted as an adjustable unit in the carriage frame in such a way that the clearances between the bearings of the working roll and the thrust plates of the toggle levers of the pressure exerting device are variable as required, within the limits of a free movement, not loaded by the said pressure exerting device, of the working roll,

the preliminary tension of the pressure exerting device being adjustable by means of an inde pendent adjusting member adapted to operate 1 independently of the adjustment of the said clearances.

ADOLF BUcEK.

REFERENCES CITED FOREIGN PATENTS Number Country Date Germany Apr. 18, 1906 

